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There is autosizing option available until you give any constraints to UI Component.
So can I use both for my ViewController?
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As you embed the buttons in the stack view, they are resized to its intrinsic size. If you want to set the width to 200, you will need to add the size constraint to the stack view. In the document view, control-drag from the stack view to itself to bring up the context menu. Choose Width to add the width constraint.
Every view must have at least two constraints: one horizontal and one vertical. You can create constraints only between a constraint handle and an anchor point that share the same plane.
Auto Layout defines margins for each view. These margins describe the preferred spacing between the edge of the view and its subviews. You can access the view's margins using either the layoutMargins or layoutMarginsGuide property. The layoutMargins property lets you get and set the margins as a UIEdgeInsets structure.
You could, but you shouldn't
You can use constraints on some views, and autosizing on others, but be careful not to mix them on the same view, as that will cause issues (the autosizing information will be lost).
iOS takes care of autosizing views by creating constraints that convey the information of the autosizing to the constraints engine. This behaviour can be enabled or disabled by the aptly named translatesAutoresizingMaskIntoConstraints property.
You could try to add constraints to a view and still have it autoresize with the old behaviour by setting this value to true, but I suggest you use constraints for every view, as it can do everything the autosizing can, and much more.
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